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CD214B-T78ALF Equivalent & Substitute Parts
Part Overview
The CD214B-T78ALF is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 78V reverse standoff voltage with 126V maximum clamping voltage and 4.7A peak pulse current capability in the DO-214AA (SMB) package format. The product is currently obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | Value | Unit |
|---|---|---|
| Manufacturer Part Number | CD214B-T78ALF | — |
| Manufacturer | Bourns Inc. | — |
| Category | Transient Voltage Suppressors (TVS) | — |
| Package / Case | DO-214AA, SMB | — |
| Voltage - Reverse Standoff (Typ) | 78 | V |
| Voltage - Breakdown (Min) | 86.7 | V |
| Voltage - Clamping (Max) @ Ipp | 126 | V |
| Current - Peak Pulse (10/1000µs) | 4.7 | A |
| Power - Peak Pulse | 600 | W |
| Operating Temperature Range | -55 to 150 | °C (TJ) |
| Mounting Type | Surface Mount | — |
| RoHS Status | ROHS3 Compliant | — |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | — |
| Product Status | Obsolete | — |
Substitute Part Grouping Explanation
Substitution of the CD214B-T78ALF is determined by strict alignment of electrical and mechanical parameters within the TVS diode category. The following criteria establish valid substitution:
Primary Substitution Criteria:
- Reverse Standoff Voltage (Typ): 78V
- Voltage - Clamping (Max) @ Ipp: 126V
- Voltage - Breakdown (Min): 86.7V
- Current - Peak Pulse (10/1000µs): 4.7A minimum
- Power - Peak Pulse: 600W
- Package / Case: DO-214AA, SMB
- Mounting Type: Surface Mount
- Unidirectional Channels: 1
Substitute Classification:
Direct Equivalents (identical electrical specifications):
- SMBJ78A (MDD) — Active product status, 4.8A peak pulse current
- SMBJ78A-TP (Micro Commercial Co) — Active product status, 4.7A peak pulse current, extended temperature range to 175°C
Similar Substitutes (voltage parameters within tolerance, minor current/temperature variations):
- TV06B780J-G (Comchip Technology) — Active product status, 4.76A peak pulse current
- TV06B780J-HF (Comchip Technology) — Active product status, 4.76A peak pulse current
Cross-Voltage Alternatives (different voltage rating, same package and power rating):
- SMBJ85A-HRA (Littelfuse Inc.) — 85V standoff, 137V clamping, 4.4A peak pulse
- SMBJ90A-M3/52 (Vishay General Semiconductor) — 90V standoff, 146V clamping, 4.1A peak pulse
Parameter Comparison
| Parameter | CD214B-T78ALF (Bourns) | SMBJ78A (MDD) | SMBJ78A-TP (Micro Commercial Co) | TV06B780J-G (Comchip) | TV06B780J-HF (Comchip) | SMBJ85A-HRA (Littelfuse) | SMBJ90A-M3/52 (Vishay) |
|---|---|---|---|---|---|---|---|
| Voltage - Reverse Standoff (Typ) | 78V | 78V | 78V | 78V | 78V | 85V | 90V |
| Voltage - Breakdown (Min) | 86.7V | 86.7V | 86.7V | 86.7V | 86.7V | 94.4V | 100V |
| Voltage - Clamping (Max) @ Ipp | 126V | 126V | 126V | 126V | 126V | 137V | 146V |
| Current - Peak Pulse (10/1000µs) | 4.7A | 4.8A | 4.7A | 4.76A | 4.76A | 4.4A | 4.1A |
| Power - Peak Pulse | 600W | 600W | 600W | 600W | 600W | 600W | 600W |
| Operating Temperature Range | -55 to 150°C | -50 to 150°C | -55 to 175°C | Not specified | Not specified | -65 to 150°C | -55 to 150°C |
| Package / Case | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB | DO-214AA, SMB |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
For Direct Replacement (Identical Voltage Rating):
SMBJ78A (MDD) and SMBJ78A-TP (Micro Commercial Co) are the primary direct substitutes for the obsolete CD214B-T78ALF. Both maintain the 78V reverse standoff voltage, 126V clamping voltage, and 600W peak pulse power rating. SMBJ78A-TP offers an extended operating temperature range to 175°C compared to the original specification of 150°C, providing additional thermal margin for demanding applications. Both parts are active products with ROHS3 compliance and unlimited moisture sensitivity rating.
TV06B780J-G and TV06B780J-HF (Comchip Technology) provide electrical equivalence with 4.76A peak pulse current, marginally exceeding the original 4.7A specification. These parts are active products with full compliance certifications.
For Cross-Voltage Applications:
SMBJ85A-HRA (Littelfuse Inc.) and SMBJ90A-M3/52 (Vishay General Semiconductor) represent higher voltage alternatives within the same SMB package. These parts are suitable only when circuit design permits higher standoff and clamping voltages. SMBJ85A-HRA operates at 85V standoff with 137V clamping, while SMBJ90A-M3/52 operates at 90V standoff with 146V clamping. Both maintain 600W peak pulse power and are active products with full compliance.
Compliance Considerations:
All substitute parts maintain ROHS3 compliance and MSL 1 (Unlimited) rating, ensuring compatibility with standard manufacturing and storage requirements. Selection should prioritize active product status to ensure long-term availability and supply chain stability.
Frequently Asked Questions (FAQ)
Q: Can SMBJ78A directly replace CD214B-T78ALF in existing designs?
A: Yes. SMBJ78A maintains identical voltage specifications (78V standoff, 126V clamping) and package format (DO-214AA, SMB). The 4.8A peak pulse current exceeds the original 4.7A specification, providing additional margin. Both parts are ROHS3 compliant with MSL 1 rating.
Q: What is the difference between SMBJ78A-TP and SMBJ78A?
A: Both parts share identical electrical specifications for voltage and current. SMBJ78A-TP extends the operating temperature range to 175°C compared to SMBJ78A at 150°C. Selection depends on thermal requirements of the application.
Q: Why are SMBJ85A-HRA and SMBJ90A-M3/52 listed as substitutes if they have different voltage ratings?
A: These parts are classified as similar substitutes rather than direct equivalents. They maintain the same DO-214AA (SMB) package, 600W peak pulse power, and general-purpose TVS diode function. They are suitable only when circuit design specifications permit higher standoff and clamping voltages. Direct voltage compatibility must be verified before selection.
Q: Are all substitute parts available in the same packaging format?
A: Yes. All listed substitute parts use the DO-214AA (SMB) package format with surface-mount configuration. Tape & Reel (TR) packaging is available for all active products, ensuring compatibility with automated assembly processes.
Q: What compliance certifications apply to all substitute parts?
A: All substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. REACH status varies by manufacturer; verify specific REACH compliance requirements for your application and supply chain.
Q: Can I use TV06B780J-G or TV06B780J-HF as direct replacements?
A: Yes. Both Comchip Technology parts maintain the 78V standoff voltage, 126V clamping voltage, and 600W peak pulse power. Peak pulse current is 4.76A, exceeding the original 4.7A specification. Operating temperature range is not specified in available data; verify thermal requirements for your application.
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